drm/amdgpu: Reject UALink handle ioctl on devices without UALink

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amdgpu_gem_ualink_handle_ioctl() dereferences adev->ualink.info before
validating it, but that structure is only allocated when the UALink IP
block is present, which is currently added only for GFX 12.1 only. The
ioctl is registered for every amdgpu device with DRM_RENDER_ALLOW, so
on any other ASIC a render node user can oops the kernel with a single
call.

Return -EOPNOTSUPP when the UALink software state is absent.

Fixes: 15d1c306d8 ("drm/amdgpu: Add ioctl infra for exporting/importing UALink handles")
Reported-by: Sashiko-bot <sashiko-bot@kernel.org>
Closes: https://sashiko.dev/#/patchset/20260914054604.12850-1-kmehltretter@gmail.com?part=1
Signed-off-by: Mukul Joshi <mukul.joshi@amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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This commit is contained in:

Mukul Joshi 2026-09-15 22:17:02 -04:00 • committed by Alex Deucher

parent c396c883a9

commit 0799087e27

1 changed files with 9 additions and 4 deletions

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drivers/gpu/drm/amd/amdgpu/amdgpu_ualink.c

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